Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sva....26..328l&link_type=abstract
(Astronomicheskii Zhurnal, vol. 59, May-June 1982, p. 543-551.) Soviet Astronomy, vol. 26, May-June 1982, p. 328-333. Translati
Astronomy and Astrophysics
Astronomy
A Stars, Calcium, Metallic Stars, Peculiar Stars, Stellar Atmospheres, Stellar Spectra, Abundance, Metallicity, Spectral Line Width, Stellar Temperature, Visible Spectrum
Scientific paper
Data on the calcium content in the atmospheres of peculiar stars, obtained with model atmospheres and from literature sources, are analyzed. The Ca I and Ca II spectra in Ap stars are studied. It is shown that the equivalent widths of Ca II K lines in the spectra of Ap stars correspond on the average to their color indices B - V, although a larger scatter is observed than for normal stars. The conclusion that the calcium content in the atmospheres of Ap stars is normal on the average is drawn on the basis of an analysis of the effective temperatures used to find the calcium content, the methods of determining the content, and the accuracy in measuring the equivalent widths of Ca I and Ca II lines. The strengthening and weakening of the intensity of the Ca II K line in the spectra of peculiar stars are most likely explained by the difference in the structures of the atmospheres of Ap stars from normal.
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